HOME AUTOMATION USING DIGITAL CONTROL

ABSTRACT

The aim of this project is to develop a home automation system that can be controlled

remotely using a landline connection. The home automation is one of the most emerging trends

in modernization of home appliance control. Presently, conventional wall switches are located in

different parts of the house and one has to physically go near them and press them to turn the

loads on/off. It becomes very difficult for the elderly or physically handicapped people to do so

This system is designed to provide control of home appliances through landline by

dialing the designated number for the particular load. Dialing can be done from the home phone

or a call made to the home number from outside. This system is designed without engaging a

programmable microcontroller but is based on digital logic using DTMF technology (Dual Tone

multiple frequency) which receives the command from the landline phone to develop digital

output. This digital signal is further processed to actuate switching mechanism through relay

driver to turn on/off the loads/appliances. It can be used to switch appliances from anywhere,

overcoming the limited range of other infrared and radio frequency type controls. This proposed

system gives a new direction to the development of home automation.

The concept of this system can be extended in future by giving an acknowledgement

message to the user by system on the status of loads by using GSM modem

BLOCK DIAGRAM:

HARDWARE REQUIREMENTS:

Transformer, diodes, capacitor, Voltage regulator,

resistor, Inverter, Flip flops, De-multiplexer, Relay, 555

Timer, DTMF decoder, Opto-isolator.